Kutta condition

Imagine that you are playing in a playground and you want to swing higher and higher. Every time you swing forward, you kick your legs out to get more speed. But as you start swinging higher and higher, you may notice that your legs start slowing you down instead. This happens because of something called "air resistance."

In much the same way, an airplane's wings generate lift, which makes the plane move forward. But as the airplane moves faster and faster, the wings also generate more and more drag, which slows the plane down.

This is where the Kutta condition comes in. It's a mathematical rule that helps engineers and scientists figure out how to design airplane wings that balance lift and drag. Essentially, the Kutta condition says that the flow of air over the wings must be smooth and continuous - there can't be any sudden breaks or turbulence.

By designing airplane wings that adhere to the Kutta condition, engineers can create more efficient planes that can fly farther and faster while using less fuel. So the next time you see an airplane flying overhead, remember: it's all thanks to the Kutta condition!